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[From open issue list in Appendix E] Implementation of SML identity constraints that use the smlfn:deref() function in sml:field/@xpath expressions is challenging for persistent SML stores built on top of relational database systems. The standards body to which SML gets submitted should investigate this and, if needed, explore options to ease the implementation burden for persistent SML stores using relational databases.
*** This bug has been marked as a duplicate of bug 4657 ***